public class Main {
    public static void main(String[] args) {
        System.out.println(new Solution().maxProfit(new int[]{1,2,3,0,2}));
        System.out.println(new Solution().maxProfit(new int[]{1}));
    }
}


class Solution {
    public int maxProfit(int[] prices) {
        if (prices.length <= 1) {
            return 0;
        }
        int[][] dp = new int[prices.length][2];
        dp[0][0] = -prices[0];
        dp[1][0] = Math.max(dp[0][0], -prices[1]);
        dp[1][1] = Math.max(dp[0][1], dp[0][0] + prices[1]);
        for (int i = 2; i < prices.length; i++) {
            dp[i][0] = Math.max(dp[i - 1][0], dp[i - 2][1] - prices[i]);
            dp[i][1] = Math.max(dp[i - 1][1], dp[i - 1][0] + prices[i]);
        }
        return dp[prices.length - 1][1];
    }
}